heart of a cos lettuce
Low in calories and rich in vitamins K and A, with moderate folate content; provides dietary fiber and various antioxidants including quercetin and luteolin.
About
The heart of cos lettuce (Lactuca sativa var. longifolia), commonly called romaine or cos lettuce, refers to the innermost, tender leaves clustered at the center of the head. Cos lettuce originated in the Mediterranean region, particularly around the island of Cos (Kos) in Greece, from which it derives its name. The heart consists of pale green to pale yellow, elongated leaves with a delicate rib running through the center and possesses a crisp texture with a slightly sweet, mild flavor and subtle nutty undertones. The heart is notably more tender and refined in texture than outer leaves, with a translucent quality and minimal bitterness.
Culinary Uses
The heart of cos lettuce is prized as a premium ingredient for raw applications, most famously as the base for Caesar salad, where its crisp structure supports creamy dressings while maintaining textural integrity. The tender leaves are ideally suited for composed salads, crudités, and refined appetizers where their delicate appearance and mild flavor enhance rather than dominate. The heart may be gently braised whole or quartered as a classical French preparation, or used as a vehicle for vinaigrettes and light dressings. Due to its structural integrity, it resists wilting and maintains crispness longer than other lettuce varieties, making it suitable for buffet applications and composed plates.